Street lamp post fob electric lamps



2 Sheets-Sheet I.

(No Model.)

' P. U. ADAMS. STREET LAMP POST FOR ELEGTRIO LAMPS.

Patented'Nov. 12, 1889* ET n mvumn n mr. Wuhington. n, c.

(No Model.) 2 Sheets-Sheet 2.

F. U. ADAMS. STREET LAMP POST FOR ELECTRIC LAMPS.

No. 414,933. I Patented Nov. 12, 1889.

N PETERS. PhMo-Liifwgnphlr. Walfington EC UNITED STATES PATENT OFFICE.

FREDERICK UFI IAM ADAMS, OF CHICAGO, ILLINOTS, ASSIGNOR OF ONE-HALF TO LEROY B. FIRMAN, OF SAME PLACE.

STREET-LAMP POST FOR ELECTRIC LAMPS SPECIFIGATION forming part of Letters Patent No. 414,933, dated November 12, 1889.

' Application filed January 8,1889. Serial No. 295,736. momma.)

To all whom it may concern: the street by each of a series of alternately- Be it known that I, FREDERICK UPHAM placed lamps and to distribute the light so ADAMS, of Chicago, in the county of Cook and thrown across the street in both directions or State of Illinois, have invented certain new over a considerable space between the adjaand useful Improvements in Street-Lamp cent opposite lamps.

Posts for Electric Lights; and I do hereby de- To this end the invention consists in the claw. that the following isafull, clear, and exprovision of a deflector in connection with act description thereof, reference being had the construction and arrangement last above to the accompanying drawings, and to the described, or deflectors, substantially as IO letters of reference marked thereon, which shown and hereinafter described. 6o form a part of this specification In the accompanying drawings, Figure l is Heretofore in lighting streets by means of a side elevation of a lamp-support and lamp electric-arc lamps several objections have constructed and combined according to my inprevailed against the support of the lamps vention and applied to a fixed street-lamp from ordinary lamp-posts, and they have acpost. The structure is here viewed in the direc- 65 cordingly been usually suspended centrally tion of the street; Fig. 2 is also an elevation of over the streets or their intersections and at the same parts viewed in the plane passing a considerable elevation. 'By this means the through the single upright of the lamp-supobjectionable effects of the strong shadows port and the point of light-emission. Fig. 3 cast by the lamp-frame have been reduced to is a plan View of the lamp as applied with 70 a considerable extent and a more uniform my improvement at the angle of a street, the distribution of the light obtained. The syslamp-support being shown in horizontal sec tem of suspension is, however, attended with tion in the line 3 3 of Fig. 1. Fig. 4 is a horimany practical difficulties and inconvenzontal section of the single upright of the ien'ces not found in the system of support lamp-frame and of the double reflector at- 75 from ordinarily-placed lamp-posts, and if the tached thereto in the line 4 40f Fig. 1. Fig. 5 is more serious objections of thelast-mentioned a plan of intersecting city streets havingmy system can be overcome itis certain to be preimprovement applied to the lamps arranged ferred for many'and obvious reasons. in alternation on opposite sides of the streets o The object of this invention is to remove and at the street-corners. 80 the difficulties attending the use of posts for' A representsa lamp-post such as are comthe support of electric-arc lamps, and, first, inonly employed in street-lighting. to provide a construction in lamp-supports B is an electric-arc lamp supported by the and an arrangement of electric-arc lamps post A, and C is the frame or support by 3 5 with respect to said supports whereby the which the lamp is immediately sustained 8 5 light may be sent lengthwise and across the from the post A. The frame C consists of a street without material obstruction. single upright C, provided with a laterally- To this end the invention consists, priprojecting arm C at the top, from which the marily, in a support for the lamp, comprising lamp B is suspended, said arm being located 40 a single upright which rises from the top of wholly at one side of the upright. The up- 90 the fixed-lamp-post proper at that side of the right is also provided with an eye 0 or other lamp toward the inside of the walk, and a equivalent form of terminal at its lower end, horizontal arm projecting from the top of by which it may be securely attached to the said upright toward the street, together with top of the post A. Preferably, the upright an arc electriclamp suspended non-rotatively C is curved or offset in its lower part out of 5 from this horizontal arm with the suspensionthe line of the post A, so as to sustain the rods of the lamp arranged in the same 'plane lamp directly in line with the post,,in order with the upright of the support. that the entire structure, including the lamp Secondly, the invention has for its object to and post, may present a regular and symincrease the quantity of light thrown across metrical appearance. In placing the frame :00

so constructed with a single upright upon a post said upright and lateral arm will be turned toward the nearest point of the adjacent building, or toward the inside of the sidewalk, and the arm toward the street, as illustrated in Fig. 5, the upright of the lamp; frame at a corner of a street being turned to the angle of the adjacent building or lot at the inside of the walk.

The lamp B, composed of the upper and lower carbon supporting members I) and b and the suspending-rods b connecting said members, is non-rotatively connected with the arm (J in such position that one of the rods 1) stands and is held directly in front of the upright G of the lamp-support, so that its shadow falls upon the upright.

By this means but a weak shadow will be cast by the outer suspension-rod of the lamp proper, and no shadow will be cast either across or lengthwise of the street, so that the more remote points to be illuminated will be reached by the full effective power of each lamp. On the other hand, the point within the shadow of the single upright C of the lamp-frame is so near to the lamp as to be "amply lighted by diffusion from the adjacent strong rays, while at the same time the surface under such shadow is narrower, because nearer, than any other upon which it can be directed. Thus by this construction and arrangement of the lamp-support C and this fixed arrangement of the lamp with respect to the lamp-support the fullest power of the lamp is made available at the points most needing it, and the necessary single shadow of the upright is cast where it is least objectionable.

Another improvement has reference to the more uniform illumination of all points of a street by lamps placed alternately upon opposite sides of the street. To this end the single upright 0', arranged on the inside, as shown,is provided with suitable reflectors 0 between it and the lamp, so that a greater amount of light is thrown across the street than would otherwise be sent in that direction, and such reflected light is sent to both sides of a point directly opposite the lamp or toward each of the adjacent lamps on the opposite side of the street. By this construction and arrangement employed in connection with rigid supports for the lamps the unequal distribution of light,which forms so serious an objection to the use of electric-arc lamps for street-illumination, is largely obviated and the number of lamps required to suitably light a street is reduced to a minimum.

It follows that by means of my invention street-lighting may be satisfactorily effected by electric-arc lamps.

I claim as my invention- The combination, with a fixed lamp-post rising from a street-walk, of a single upright connected with the top of the post, an arm projecting from the top of the upright toward the street, an electric-arc lamp suspended non-rotatably from said arm and having the rods which connect the upper and lower members of the lamp in the same plane with the upright.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

FREDERICK UPI-1AM ADAMS.

Witnesses:

TAYLOR E. BROWN, M. E. DAYTON. 

